Below are a couple of older TPS Handbooks for those interested in the historical angle. The first actual TPS handbook was compiled in 1973 and edited by Isao Kato. The forward was written by Taiichi Ohno and several authors contributed. The contents are in Japanese. There is a short journal article published in 1977 by Fujio Cho and several other authors. I have also included a shorter handbook I created some years ago in English. Warning: I highly recommend that you do not try to translate and sell the Toyota 1973 version for profit. It was attempted by one party once in Japan without permission and met with the threat of a lawsuit.